Quiz Submissions - Chapter 17 Quiz
[redacted 1] (username: [redacted 2])
Attempt 1
Written: Mar 11, 2020 3:20 PM - Mar 11, 2020 3:41 PM
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Question 1 		0 / 1 point

The nuclear reaction that produces most of the energy for massive main-sequence stars is called the CNO cycle.
Question options:
Correct>	A) True
>	B) False
Question 2 		1 / 1 point

High mass stars differ from low-mass stars in that they burn helium to carbon when on the main sequence.
Question options:
	A) True
>	B) False

Question 3 		1 / 1 point
Most of the uranium (atomic mass = 238) found on the Earth formed in Type II supernova explosions.
Question options:
>	A) True
	B) False
Question 4 		1 / 1 point

The densest state of matter found in nature occurs inside a white dwarf star.
Question options:
	A) True
>	B) False
Question 5 		1 / 1 point

Every pulsar is a neutron star, but not every neutron star is a pulsar.
Question options:
>	A) True
	B) False
Question 6 		1 / 1 point

As a high mass main sequence star evolves off the main sequence, it follows a ____________ on the H-R diagram.
Question options:
	

a) 
	

nearly vertical path
	

b) 
	

path of constant radius
	

>c) 
	

roughly horizontal path
	

d) 
	

path of declining luminosity
	

e) 
	

path of increasing temperature
Question 7 		1 / 1 point

How does nucleosynthesis depend on the mass of the star.
Question options:
	

a) 
	

With increasing mass, heavier and heavier elements are formed throughout their interiors.
	

>b) 
	

With increasing mass, heavier and heavier elements are formed in their cores.
	

c) 
	

With increasing mass, elements between helium and gold are formed in their cores.
	

d) 
	

With increasing mass, elements between helium and carbon are formed in their cores.
	

e) 
	

All stars more massive the eight solar masses create elements from helium through uranium in their cores.
Question 8 		1 / 1 point

If you measure the average brightness and pulsation period of a Cepheid variable star, you can also determine its:
Question options:
	

a) 
	

composition
	

b) 
	

rotational period
	

>c) 
	

distance
	

d) 
	

age
	

e) 
	

mass
Question 9 		1 / 1 point

The nuclear reaction that releases the most energy per kilogram is:
Question options:
	

a) 
	

helium fusing to carbon
	

b) 
	

silicon fusing to iron
	

c) 
	

oxygen fusing to silicon
	

d) 
	

carbon fusing to magnesium
	

>e) 
	

hydrogen fusing to helium
Question 10 		1 / 1 point

A neutron star contains a mass of up to 3 solar masses in a sphere with a diameter approximately the size of:
Question options:
	

a) 
	

an atomic nucleus
	

b) 
	

an apple
	

c) 
	

a school bus
	

>d) 
	

a city
	

e) 
	

the Earth
	
Attempt Score:
9 / 10 - 90 %
Overall Grade (highest attempt):
9 / 10 - 90 %